Hmmm... seems that we need to have an amendment limiting the judiciary power.
But, at one point, I believe the Supreme Court ruled that they were the Supreme authority on all matters constitutional and they would probably tell everyone that it was unconstitutional to limit their power/authority...
But we neither need, or should desire a constitutional amendment against same sex marriage... It should be left where it is, at the state level. Who knows, at some point maybe there will be a "gay state" kind of like Utah is the mormon state.